[Cmake] Added directory tree to VS solution.

This recreates structure from premake almost 1:1

cmake/XeniaHelpers.cmake

@@ -94,6 +94,27 @@ function(xe_target_defaults target)
   )
   if(MSVC)
     target_compile_options(${target} PRIVATE /WX)
+    # Recreate directory structure in Visual Studio filters
+    get_target_property(_srcs ${target} SOURCES)
+    if(_srcs)
+      set(_local_srcs)
+      set(_external_srcs)
+      foreach(_s IN LISTS _srcs)
+        get_filename_component(_abs "${_s}" ABSOLUTE)
+        string(FIND "${_abs}" "${CMAKE_CURRENT_SOURCE_DIR}" _pos)
+        if(_pos EQUAL 0)
+          list(APPEND _local_srcs "${_s}")
+        else()
+          list(APPEND _external_srcs "${_s}")
+        endif()
+      endforeach()
+      if(_local_srcs)
+        source_group(TREE ${CMAKE_CURRENT_SOURCE_DIR} FILES ${_local_srcs})
+      endif()
+      if(_external_srcs)
+        source_group(TREE ${PROJECT_SOURCE_DIR} PREFIX "External" FILES ${_external_srcs})
+      endif()
+    endif()
   elseif(NOT CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
     # GCC is too noisy for -Werror; only apply to Clang
     target_compile_options(${target} PRIVATE -Werror)
@@ -242,6 +263,7 @@ function(xe_test_suite name base_path)
     target_link_libraries(${name} PRIVATE ${ARG_LINKS})
   endif()
   xe_target_defaults(${name})
+  set_target_properties(${name} PROPERTIES FOLDER "tests")
 
   if(MSVC)
     # Disable Edit and Continue - breaks Catch2 __LINE__ usage